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Obradovicite-NaCu

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Formula:
Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]
Colour:
Yellowish green
Lustre:
Sub-Adamantine, Vitreous
Hardness:
2
Crystal System:
Orthorhombic
Name:
For the mineral Obradovicite and its potassium and copper content.
First recognized as a potential hypothetical member of the Betpakdalite group (IMA 10-E). Later in 2011, approved by IMA as a valid species. Found on the type specimen of obradovicite-KCu (formerly obradovicite) from the Chuquicamata mine, Chile.




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Classification of Obradovicite-NaCuHide

Approved
Approval Year:
2011

Pronounciation of Obradovicite-NaCuHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of Obradovicite-NaCuHide

Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellowish green
Streak:
Very pale yellowish green
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Splintery

Optical Data of Obradovicite-NaCuHide

Type:
Biaxial (-)
RI values:
nα = 1.790(3) nβ = 1.798(3) nγ = 1.805
2V:
Measured: 86° (5)
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v, strong
Pleochroism:
Non-pleochroic

Chemical Properties of Obradovicite-NaCuHide

Formula:
Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]
IMA Formula:
[Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Crystallography of Obradovicite-NaCuHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Cell Parameters:
a = 14.872(4) Å, b = 11.091(3) Å, c = 15.032(4) Å
Ratio:
a:b:c = 1.341 : 1 : 1.355
Unit Cell V:
2479.4 ų
Z:
4
Morphology:
Short bladed crystals, flattened on {001}, elongated parallel to [010]. Size: Up to ~0,1 mm in length. Forms observed: {001}, {110} and {101}. The {001} are showing striations paralllel to [010]. Often double terminated.
Twinning:
No twinning observed.
Comment:
Space group: Pnmb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.483(43)
8.936(100)
7.452(21)
3.226(25)
2.980(25)
2.898(29)
2.773(22)
2.598(23)

Type Occurrence of Obradovicite-NaCuHide

General Appearance of Type Material:
Sugary aggregates intermixed with fragmented quartz crystals embedded in a porous boxwork of hematite and goethite.
Place of Conservation of Type Material:
Colorado School of Mines Geology Museum, Golden, Colorado, USA, catalogue number 86.496
Geological Setting of Type Material:
Oxidation zone of porphyry copper deposit
Associated Minerals at Type Locality:

Synonyms of Obradovicite-NaCuHide

Relationship of Obradovicite-NaCu to other SpeciesHide

Other Members of this group:
Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
Obradovicite-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] Orth.

Fluorescence of Obradovicite-NaCuHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Obradovicite-NaCuHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R. and Mills, S.J. (2011): Obradovicite-NaCu, IMA 2011-079. CNMNC Newsletter No. 11, December 2011, page 2893; Mineralogical Magazine, 75, 2887-2893
Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207.

Internet Links for Obradovicite-NaCuHide

Localities for Obradovicite-NaCuHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile (TL)
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Chuquicamata District
Kampf, A.R. and Mills, S.J. (2011): Obradovicite-NaCu, IMA 2011-079. CNMNC Newsletter No. 11, December 2011, page 2893; Mineralogical Magazine, 75, 2887-2893
Mineral and/or Locality  
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